Grade d: completely colorless. The highest color level is extremely rare.

Class e: colorless. Only gem experts can detect trace colors. This is a very rare diamond.

Class f: colorless. A small amount of color can only be detected by jewelry experts, but it is still considered colorless. It belongs to high quality diamonds.

G-H grade: almost colorless. Compared with higher grade diamonds, it has a slight color. But diamonds of this color still have high value.

I-J grade: almost colorless. A slight color can be detected. The value is higher.

K-M grade: dark color, poor fire color.

N-Z grade: dark color, poor fire color.

Diamond clarity grade table

FL means that the diamond is clean under the magnifying glass which is 0/0 times of the gem/kloc, that is to say, there are no inclusions inside and outside the gem.

IF means that the diamond has no flaws under the 10 times gem magnifying glass, but there may be some flaws on the surface, which can be removed by grinding again.

VVS means that there are tiny flaws in the pavilion or surface of a diamond when it is observed under a gem magnifying glass which is 10 times. The difference between VVS 1 and VVS2 is that the latter has small cotton spots and stubble.

VS refers to the tiny flaw that a diamond can see under the magnifying glass of 10 times. The difference between VS 1 and VS2 is that the latter may have tiny cotton spots or cotton stubbles.

SI means that it is easy to see defects when observing diamonds under a 10 times gem magnifying glass, but it is invisible to the naked eye.

I 1, I2, I3 refer to the small flaws that are easy to see when a diamond is observed under a gem magnifying glass with a magnification of 10, which are just visible to the naked eye, and some have obvious cleavage and cracks.